1. Research Overview Sencun Zhu Asst. Prof. CSE/IST, PSU szhu@cse.psu.edu

2. Ongoing Work  Sensor Network Security Security and privacy support for data centric sensor networks Self-healing sensor networks (supported by ARO) Secure sensor data aggregation  Ad Hoc Network Security Network access control Traceback of compromised nodes  Overlay (P2P) Network Security Detection and identification of attackers Secure routing  Malicious Code Prevent virus and worm self-propagation Detecting buffer overflow attacks

3. Distributed Sensor Networks  Berkeley Mica2 Mote (2002): 4 MHZ processor, 4 KB RAM 19.2K bit rate OS: TinyOS cost: about $150  Berkeley Spec (2003): size: 2 mm * 2.5 mm cost: <$1  Eventual goal: smart dust size: 1 mm 3 Types of sensors temperature humidity vehicular movement pressure acoustic light magnetic Mica2Mica2dotSpec  Self-organize into multi-hop wireless sensor networks

4. Sensor Network Applications  Military applications battlefield surveillance, battle damage assessment, biological and chemical attack detection  Environmental applications fire, flood, air pollution detection  Health applications patient monitoring, diagnostics, drug administration  Home applications home automation, smart environment  Other commercial applications transportation, vehicle tracking, interactive toys

5. Security Threats  Physical destruction of sensor nodes  Radio jamming (physical layer attack)  Higher layer attacks by both outsiders and insiders (compromised nodes) eavesdropping on communications injecting false data  deceiving the base station  resource consumption attacks dropping, altering, or replaying packets Attacks can target both the application and the underlying networking protocols

6. Security and Privacy Solution for Data-centric Sensor Networks

7. The Framework and The Security Building Blocks